[xún huán]
circulate; circle; round; repeat; loop; period; recurrence; cycling; circulating; mixing; circulation; rotation; recursion
move in endless cycles
循環(huán)不息
vicious circle
惡性循環(huán)
the cycle of the seasons
四季的循環(huán)
blood circulation
血液循環(huán)
extracorporal circulation
體外循環(huán)
four stroke cycle
四程循環(huán){機(jī)}